更改Jackcess的数据类型定义

Question

I have a program built that takes my access DB and exports to a CSV. Everything works great but the program that takes in the exported CSV has some hardcoded regex and cannot handle the different format of certain datatypes.

Date
IS: Fri May 01 00:00:00 EDT 2015
NEEDS: 5/1/2015 00:00:00

Boolean?
Not sure if these field are a boolean but
IS: TRUE or FALSE
NEEDS: 0 or 1

Currency
IS: 0
NEEDS: $0.00

Strings
IS: string
NEEDS: "string"

After reading through the docs this line jumped out at me " the row values are strongly typed Java objects. In Jackcess, the column types are represented by a Java enum named DataType. " Any help is greatly appreciated.

Answer 1

Use uniVocity-parsers for that:

    Writer output = new StringWriter(); // use a FileWriter for your case

    CsvWriterSettings writerSettings = new CsvWriterSettings(); //many options here, check the tutorial

    ObjectRowWriterProcessor writerProcessor = new ObjectRowWriterProcessor(); // handles rows of objects and conversions to String.
    writerSettings.setRowWriterProcessor(writerProcessor);
    writerSettings.setHeaders("A", "B", "C", "D", "E", "F", "G", "H");

    CsvWriter writer = new CsvWriter(output, writerSettings);

    writerProcessor.convertFields(Conversions.toBoolean("0", "1")).add("C", "H"); // will write "0" and "1" instead of "true" and "false" on column "C" and "H"
    writerProcessor.convertFields(Conversions.toDate("M/d/YYYY HH:mm:ss")).add("A", "E");
    writerProcessor.convertFields(Conversions.formatToBigDecimal("$#0.00")).add("B", "D");

    writer.writeHeaders();
    writer.processRecord(new Date(), BigDecimal.TEN, true, new BigDecimal("999.99"), new Date(), "some text here", null, false);
    writer.processRecord(new Date(), BigDecimal.ZERO, false, null, null, null, "more text here", null);
    writer.close();

    System.out.println(output.toString()); //and here is the result

The output will be:

A,B,C,D,E,F,G,H
7/8/2015 07:09:58,$10.00,0,$999.99,7/8/2015 07:09:58,some text here,,1
7/8/2015 07:09:58,$0.00,1,,,,more text here,

Disclosure: I am the author of this library. It's open-source and free (Apache V2.0 license).